Re: [HACKERS] Parameter oddness; was HS/SR Assert server crash

2010-05-14 Thread Bruce Momjian
bruce wrote:
  and my slave recovery.conf was:
  
  restore_command = 'cp /u/pg/archive/%f %p'  # e.g. 'cp 
  /mnt/server/archivedir/%f %p'
  standby_mode = 'on'
  primary_conninfo = 'host=localhost port=5432'   # e.g. 
  'host=localhost port=5432'
  
  Let me know what additional information I can supply.
 
 I saw Simon's commit fixing this bug.  Another good reason we didn't
 bundle 9.0 beta2 yesterday.

I can now confirm that Simon's patch fixes the bug.  (Unfortunately I
had a web cast yesterday about this feature and the bug prevented me
from completing the demonstration.)

FYI, my presentation shows all the steps necessary to setup HS/SR:

http://momjian.us/main/presentations/technical.html#hot_streaming

One odd thing is we have two paramters that mention hot_standby --- on
the master we have to do in postgresql.conf:

wal_level = hot_standby

and on the slave we do in postgresql.conf:

hot_standby = on

That is a little confusing.

-- 
  Bruce Momjian  br...@momjian.ushttp://momjian.us
  EnterpriseDB http://enterprisedb.com

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Re: [HACKERS] Parameter oddness; was HS/SR Assert server crash

2010-05-14 Thread Kevin Grittner
Bruce Momjian br...@momjian.us wrote:
 
 One odd thing is we have two paramters that mention hot_standby
 --- on the master we have to do in postgresql.conf:
 
   wal_level = hot_standby
 
 and on the slave we do in postgresql.conf:
 
   hot_standby = on
 
 That is a little confusing.
 
Why?  I read that as saying that the master is writing sufficient
data into the WAL for it to be usable for hot standby purposes, and
that that the slave machine is going to be used as a hot standby. 
You'd better do the former if you're going to do the latter, but
there were good reasons not to try to infer one setting from the
other.
 
-Kevin

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Re: [HACKERS] Parameter oddness; was HS/SR Assert server crash

2010-05-14 Thread Bruce Momjian
Kevin Grittner wrote:
 Bruce Momjian br...@momjian.us wrote:
  
  One odd thing is we have two paramters that mention hot_standby
  --- on the master we have to do in postgresql.conf:
  
  wal_level = hot_standby
  
  and on the slave we do in postgresql.conf:
  
  hot_standby = on
  
  That is a little confusing.
  
 Why?  I read that as saying that the master is writing sufficient
 data into the WAL for it to be usable for hot standby purposes, and
 that that the slave machine is going to be used as a hot standby. 
 You'd better do the former if you're going to do the latter, but
 there were good reasons not to try to infer one setting from the
 other.

My point was that the string 'hot_standby' is both a variable and a
setting.

-- 
  Bruce Momjian  br...@momjian.ushttp://momjian.us
  EnterpriseDB http://enterprisedb.com

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